[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] sse, mmx support for hvm guests
Masking from CPUID should work. I'm surprised it would cause a guest to fail to boot. K. On 25/10/08 23:30, "Ashish Bijlani" <ashish.bijlani@xxxxxxxxx> wrote: > it's just masking the sse/mmx features from cpuid return value or > something more to it? because i tried masking sse/mmx features from > cpuid and now the hvm domain doesn't boot!! any idea if sse/mmx > support can be disabled using bios? > > Thanks, > Ashish > > On Sat, Oct 25, 2008 at 7:13 PM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> > wrote: >> On 25/10/08 20:34, "Ashish Bijlani" <ashish.bijlani@xxxxxxxxx> wrote: >> >>> I've a quad-core x86_64 machine (Intel Xeon), with sse/mmx support. >>> However, I want to disable sse/mmx support from HVM guests. How can I >>> do this? Also, is it reasonable to expect illegal instruction fault in >>> non-root VMX mode if a guest VM runs an application with sse/mmx >>> instructions? >> >> You can hide SSE/MMX in CPUID info, so the guest should not attempt to use >> the instructions. This is obviously true since CPUID causes vmexit and then >> the instruction is always emulated. But I don't think you can make the >> sse/mmx instructions fault if the guest does actually try to use them >> anyway. >> >> -- Keir >> >> >> _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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